What was number 1 in the charts on 30th August 2007?

The official UK singles chart on 30th August 2007, was as follows:

(1) "Beautiful Girls" by Sean Kingston

(2) "Stronger" by Kanye West

(3) "Umbrella" by Rihanna featuring Jay-Z

(4) "Hey There Delilah" by Plain White T's

(5) "Grace Kelly" by Mika